David mcconnel smyth



(No Model.)

B. M00. SMYTH.

BOOK SEWING.

No. 338,000. Patented Mar.'16, 1886 v adj UNITED STATES PATENT OFFICE.

DAVID MOCONNEL SMYTH, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE SMYTH MANUFACTURING COMPANY, OF SAME PLACE.

BOOK-SEWING.

EEECIi-"ICATION forming part of Letters Patent No. 338,000, dated March 16, 1886.

Application filed February It), IP85. Serial No. 156,014. (No model.)

T ct whom, it may concern:

Be it known that I, DAVID MoCoNNEL SMYTH, of Hartford, in the county of Hartford and State of Connecticut, have invented an Improvement in Book-Sewing, of which the following is a specification.

\Vith some classes of books, especially account-books, it is important that the threads which unite the signatures together shall be in the same place in each signature, so that uniformity ofstrength be obtained. This cannot be the case where the threads in one signature are opposite places in the next signature where there are no threads.

The object of the present invention is to produce uniformity in the sewing in each signature with those in the next with a strong but elastic looping.

I make use of semicircular needles working in pairs. If the book is small, one pair will be suflicient. The larger books are sewed with two, three, or four or more pairs of these needles. As each pair operates in the same manner, I have only shown one pair, and will proceed to describe the mode of operation of the same.

In the drawings, Figurel is an elevation of the needles and a signature being sewed. Fig. 2 is a representation of part of a book-back,

0 showing also the manner in which the threads are laid together.

The signatures are usually sawed at the places where the needles pass in and leave the folded signatures. The needles Z Z are each 5 in the form of a half-circle, and upon the arm that projects from the shaft k and to the needles the proper oscillating movements are given. By reference to my Patent N 0. 220,312 a full description of these needles and the manner of operating them will be found. In my present improvements, however, the needles are placed in pairs, and partial rotations are given in opposite directions, so that the needles penetrate the fold of the signature at the 5 points 2 3 simultaneously and emerge at 4 5 simultaneously; hence such needles are oscillated or swung in opposite directions simultaneously, and they enter each signature and sew it in the same manner, so that all the signatures are uniformly sewed.

I make use of suitable looping devices, a"- one at the point of emergence of each needle.

A looper and devices for operating the same are shown in my Patent No. 250,991, and such a looper is available with the present improve- 5 5 ment. The needles are passed in at the notches 2 3, and their points project through the notches 4 5. The loopers a moveforward and take a loop of the thread from each needle. The needles draw back,leaving double threads through the folds of the signatures. Another signature is added. The needles enter its notches, and as the points emerge they pass into the loops held by the loopers a". The loopers retire and drop the loops over the points of the 6 needles and then move forward again and take fresh loops of thread from the needles and hold them, and so on the sewing progresses, there being a chain of loops in the notches 4 5 and the threads passing at 2 and 3 out of one signature into the next.

At the notches 2 and 3 it is preferable to interl ace cross-threads. There may be one at each notch, the same being laid in by a vibrating eye, a as shown in my Patent No. 274,986; but I prefer to make use of one thread, 121., interlaced with the threads from the two needles. This is effected by the vibrating eye carrying the thread to the right of the place where the needle Z enters at one stitch and then to the left of the place where the needle Z enters at the next stitch, so that the thread m will be interlaced across and across between the notches 2 and 3, and will bind the threads together as they pass out of such notches in the S 5 manner shown in Fig. 2.

After the sewing has been performed or during the progress of that sewing, a tape or strip of parchment, n, (shown by clotted lines in Fig. 2,) may be laid beneath the threads m, 0 and thereby aid in strengthening the binding.

I have shown and described the needles and loopers that can be used for performing the sewing. The mechanism, however, is not claimed herein, as the same forms the subject 9 5 of my application No. 169,255, filed June 20,

I claim as my invention- 1. In book-sewing, the combination, with the folded sheets or signatures, of threads ICQ passing in at the inner notches, 2 3, and looped at the outer notches, 4 5, with the threads in the next signatures, the threads at the notches 2 3 passing from one signature to the next, 5 substantially as set forth.

2. In book-sewing, the combination, with the folded sheets or signatures, of threads passing in at the notches 2 3 in each sheet and looped at the notches 4 5, and the interlaced :0 thread at the notches 2 '3, substantially as set forth.

3. In book-sewing, the combination, with the folded sheets or signatures, of threads passing in at the adjacent notches 2 3, led in 15 opposite directions, looped at- 4 5 with the threads in the next signatures, in combination with the thread m, interlaced across alternately-with :the threads that pass into the DAVID MOCONNEL SMYTH.

Witnesses:

J. S. TRYON, W. B. MoORAY. 

